Casing cutter



April 22, 1930.

W. L. CHURCH CASING CUTTER Filed Aug. 2. 1926 wherein:. v .;F1gxireil shows-a vert cal sectional v ew; of

, gb thefiiiiplerr ent'showing the cutters partially r Patented APL TZZ, I

'fA iieaiibii fiieiijiiii' use 2,1936; Serial 1%.- 12 ,426. I

r inventioiirelates i0 is; and iii i im roven entsiin a casing cutter.

,ne object-.ofthe invention is to provider I an-implement of the-character; deSCI'lbQd 5 specially designed; for use in cutting casing,"

or; pipe,s tu'ck iiia well'bore, so that the same maybe withdrawn a sectionat a time." ;Ai1other'.ohject oi theinven'tion is to 'pro- 7 'vide animplement ofthe character described,

embodying cut.te,r body-{with radially mo.v-.

' ablecuttersand means operable byfluid pressure to, force thecuttersintoengagement with the pipetov becut,-as' -the cutter is-rotated'.

I I i further; object ofthejinvlention resides in the provis-ioh of means through which the.

flu m yb -bu cit-sa h cutters re ase for; withdrawal, as'soon as the casing or p pe,

hasheen severedr Astill further featiireoithe invention r w s intheprovision ofa novelftype of cutr em loyed-v. i

' i ith the i boveand other 'bb e i i i View f this inventionjhas. particular relation to certiq e d ar ngem nt o Par an exa p e iwhichisi r n, in'th i pe ifi ion nd-ai ti ed: in th ',a p yin rawi g p ted a d V i-E fl o s a n V w Of he c ters in perativerelationiwithithe iQ E LHdIQIRaSSO-Q rci'atedf therewith, -aridshowing' the bOdY 'LlLII section on the line 2520f Figure 1. V

V the numeral ldesignates a cutter body having 4 theaxiallyoniovablemandrel 2 therein, Whose "lowerei d is tapered and works between the oppositely. disposedlcutters 3; which are rao 1 dially movable inradiallslots orbearingsin V l li Q b dYo l -L ttach dltq helow 6 .0

15 the bodythere' is a conventional'drill bit 4,

P AME, or nousroitirnxhs' V upper end, of this spring. I

o fa nQv l eatu s; 5 t onst ucti pe 1 2:5

fReferring ow; more particularly the drawings, wherein likenuIheralsofreference designate similar parts in eachl'ofthe figures I r I a a cutte'ris attached andwill-pass downthrough provided to remov e'froni thecasing, 0i 7 to'be cut, anydeposits that may have settled therein so as to permit the cutter to below- I ereclin the pipe to be cut. ;.There are-flat springs 5, 5,,attached at their upper ends to the h0dy,on opposite sides and-the-lower ends ofthesesprings rest against the shoulder 6, fi carriedrby thev upper sides of the.

cutters 3,an d;retain the; cutters in their bearings. The upper end'ofthe body is formed there is a suitable plunger-.18, carried bythe, Y

mandrel "2. A c'oil Spriiigfi rests onthe bottom of said [cylinder and; surrounds the mandrel--2 and -the-plunger Sjrests against the Secured tothe fupper end Qof the cylinder 7 there is a spiderlO having a'jfluid passageway into the cylinder and which 1 supports the valve seat 11v and. cooperating with said seat 6' I I there; is an upwardly opening ball valve .12 which is, confined: by the conventional valve cage. 1? screwed vonto said seat, g-The valve 7 12 is disposed above and:is aligned: with i and H 'n rm y's lp q dib st e ppe e he i mandrel 2 which extends; up through 1 saidp assageway'. The valve 12 is arranged above said seat; andcontrols said passageway; a In operation the implementwill: be at} tached to the lowerend'cf the string ofpipe and will be thereby lowered into the casing to be cut; Ifthe casingisffilled with earth formation'the implement inay be rotated and the bit4will disintegratesuch formation so V that it maybe washed out until the cutter is lowered tothe desired point;

] Water, under pressure, is ,thenpumped down through the string o ipipe to which the the plunger'moves downwardly the inandrel 2 will he forced downwardly, throughathe axial bearing 1a ofthe' head 1 and its ta'peredl 1 lower end willfworkj against the downward j with, c iiii eia 7,. and within :the cylinder t converging faces 15, 15,0f the cutters 3 and force said cutters outwardly into contact with the casing to be cut. Meanwhile the cutter isrotated and as cutters 3, 3, are forced out wardly they will gradually penetrate and eventually sever the casing to be cut.

The plunger 8 has restricted water courses 16, 16, therethrough through which a part of the pressure fluid is permitted to pass, said fluid passing through the bearing 14 and out through the water course 17 provided in the bit. These channels 16, 16, are provided sothat the pump may continue 'to operate' and will not be completely stopped. y c.

.When the tapered lower end of the'mandr'el" passes through" between the cutters? 3; and said cutters are fully expanded'orprojected the casing to be out will be severed this happens the pump will be stopped, indieati rrg' to the:operator that the =-casing has beenr: entirely sev'ere'd and thereupon the spring-'Wwilhlii t the plunger 8 carrying the mandrel 2*wu pwardly with it and releasing said mandrel from the cutters 3 and 'lifting itsvalve l2 fromits seat.= P a Itistd be notedthat the outeredge or margin of; each cutter is'serrated as at l8'so as-to more *rea-d'ily'cut 'into the casingand 3 furthermore that theteeth" of said o-utters'are V tapered ormtormed wedge-shaped. When the ter's in said body, a mandrel connected to'the casing has beensevered an upward pullmay be exer ted on the :implement through the stem l and the sloping upper side of the teeth contacting against the lower end of the severed section, and 4 assisted bythe "springs 5, 5,- will force the cutters inwardly so that the -inipleinent ma -be withdrawn? "351W a I 'lxfvl '1 2 7 V 1 1- A device of the" character described ineluding a bodygia fluid pressure cylinder, as sociated therewith, a pl'ung'er in'said cylinder, valve controlling the admission 'of pressure fluid into said cylinder radially movable cutplunger and whose lower end is adaptedf to work between said}- cutters and .whoseupper end isalignedbeneath s'aid valve' a yieldable member associate dflwith the mandrel and nor mally holding the same inposition to; release said cuttersand"-to hold "said valve open, means *connectedto said cutters and normally tending o niov them inwardly relative to sai'dbodyfl i fr 2. AS deviceof the character described including a body radially movable cutters therein, a cylinder associated'with said loody, a plunger therein; an -axially movable mandrelin' the body connected to theplunger and having ti tapering portion adapted to work between the cutters to project the same out= wardly,-an upwardly opening valve adapt'ed to control the inlet df pressure fluid into" said cylinder above the plunger, a yieldable member normally holding the said mandrel in m operativerelation with said cutters with its upper end in position to'support said valve in open position. 7 r 3. A device of the character described including a body, radially movable cutters therein, a cylinder associated with saidbody, a plunger therein, an axially movable man-V 'drel in the body connected to the plunger and having a tapering portion adapted to work between the cutters to project the same outwardly, an upwardly openin'g'valve adapted 'tocontrol the inlet "of; pressure fluid into said cylinder above the plunger, a yieldable member normally holding said mandrel in inoperative?frelationwithssiid'cuttrswith "its upperendin'position to support said valve {in-open position and means normally tending and the valve 12 will seat on the seat 11 and" block the flow of fluidr-downwardlye When cluding a cutter body, radially movable cut ter s :assoeiate'd therewith; a cylinder a'so ciated with said body; a plun er in'said eyh inde'r; a mandrel axiallymovablinsaictbel andto' which the; plunger 'is fixed; 'i'dLfcyl inder having an inlet passageway a-vawe controllin said passageway and normally' held in open position}: by ':saic t{maiidre1;f to adin'it' fluid under pressure intosai'c l -cylinder whereb said plrni er and mandrel may n; actuated in one direction to p'roject said cut 1* ters eutward1yand permit the clesi at said passageway'by said'valva PH a a? w 51 A device 'ofjthe character"described includin'g' a ctltter body,'hadially movable cut-.- 1 tars-:assoeiated "therewithfa "cylinde -ass6-- ciated'with' s'aid body'yaplunger' i aid eyl j inder, a mandrel akiallyniov abldin said may and to which the plunger isifited; san ty inder having an inlet; passa eway, i a tagve controlling-- sai'd' pas'sageway aii'd nema l 3 held inopenposition by said ma drfi tiad mit "fluid 1 tinder pressure intoi said cylinder whereby said plunger and' m-an'drel finty be actuated"in one airs-ca ers prej ectsa'i'd cut ter's eutwardly and p ermiethe blosing bf s d passageway by said vialte andiriieans ma1-1 y=-"rndingao aemate the plung mandrel in the other direction. 1? 1 V Gf-" Aca's'ifig cutter includingtabod a fluid plunger in said cylinderhaving a rest" ted water coursetherethr-ough, said-cylinder a i g amines passa ewa g-a valve 'n railing said passagewayriadia-lly mbvablebiitters ih said body, arm'andr'el connectedto the filling er *wliose lower end is adapte'd towbr be tween said cutters? and whose up er n'df extended up through said; inl'et"*passag M 'ay andfal igried"underneaththev w a yiemaB- e member associatediwiththe mandrel ori mally'holdingthe same iii'po'siftidnftd lease s'aid cut ers and to ho'ld sensit ve open.-**"** 7, fldevice ofihe clfaiatfter describd in cluding aibodyg-a fluid press re Za's= p, 1,2: i-xuli' 'tlLi .1 1""i'ii 1. 3":2 Li- \li'ifii.

sociated therewith, aplunger said cylin'der, a valve controlling the admission ofpressure fluid into said cylinder, radiallymovable cutters in said body, a mandrel connected to the plunger whose lower end'is adapted to work I between saidcutters and whoseupper end is aligned beneath said valve, a yieldable member associated with the mandrel and'normaL ly holding the same inpositionjto' release said cutters and to hold said valve open.

' In testimony whereof I haves'igned my name to this specification."

- WALTER L CHURC 

